Ted Cruz

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Sen. Ted Cruz, Texas Republican, blames Senate Democrats and the administration for the lack of progress made in the investigation into the Benghazi attack. (Associated Press)

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FILE - In this April 25, 2014, file photo, Republican U.S. Sen. Ted Cruz, of Texas, addresses a crowd during a rally at the Western Republican Leadership Conference in Sandy, Utah. Cruz will visit Ukraine this month and meet with leaders of the protest movement that forced out the country's pro-Russian president, his office said Tuesday, May 13, 2014. (AP Photo/Rick Bowmer, File)

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Sen. Ted Cruz, R-Texas, gives the commencement address Saturday, May 10, 2014, at Stephen F. Austin State in Nacogdoches, Texas. (AP Photo/Nacogdoches Daily Sentinel, Andrew D. Brosig)

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** FILE ** In this Dec. 17, 2013 file photo, Sen. Ted Cruz, R-Texas speaks with reporters on Capitol Hill in Washington. (AP Photo/J. Scott Applewhite, File)

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** FILE ** Senate Rules Committee member Sen. Ted Cruz, R-Texas, right, joined by the committee's ranking member Sen. Pat Roberts, R-Kansas, speaks on Capitol Hill in Washington, Wednesday, April 30, 2014. (AP Photo)

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Sen. Mike Lee, R-Utah, left, and Sen. Ted Cruz, R-Texas, greet the audience during a rally at the Western Republican Leadership Conference Friday, April 25, 2014, in Sandy, Utah. Cruz, headlined the final day of a two-day conference in Utah where Republican party leaders from western states are meeting. (AP Photo/Rick Bowmer)